Bit holder



Jap. 1921- 1,613,693",

J. DAVIS BIT HOLDER Filed June 10, 1924 v I .L 7

/a 5 I Z 3mm 7211 flavzix Patented Jan. 11, 1927.

tii liTE SAT-ES JAKE DAVIS, F HABLAN, KENTU'OKY.

BIT HOLDER.

Application filed June 10, 1924. Serial No. 719,205.

This invention relates to an improved bit holder, and I aim primarily toprovide a new structure of this class which is such in construction thatthe bit can be inserted and removed in comparatively limited spaces inwhich devices of this class are necessarily used.

Another aim is to provide a device of this class wherein the bit islongitudinally adjustable to permit the use thereof even after the pointof the cutting blade is broken by extending the bit outwardly.

More specifically speaking, what I aim to do is to provide a device ofthis class whereway and the holder is provided with a r0- tary key whichis adapted to be turned into the keyway for retaining the bit in place,this arrangement absolutely insuring against ii) lost motion of the bitand obviating the necessity of using comparatively large wrenches suchas are ordinarily required in removing and inserting the common type ofbit now in use.

Other features and advantages of the invention will become apparent fromthe following description and drawing.

In the accompanying drawing forming a part of this specification and inwhich like numerals are employed to designate like parts throughout thesame:

Figure 1 represents a side elevation of an improved bit and holdertherefor constructed in accordance with. the present invention.

- Figure 2 is a similar view showing the holder in section to disclosemeans more clearly.

Figure 3 is'a vertical section taken in substantially right angles toFigure 2.

the retaining -1 Referring now to the drawings more in dewhat may beconveniently termed keyways.

The body 1 opposite the upper keyway is formed with a transverse holeextending therethrough and a pin 6 is rotatably mountin the bit isformed with a groove or key point 4. In accordance ed in this hole. Thispin constitutes a retaining key. On its opposite ends the key or pin isprovided with heads 7 and 8 re spectively which serve to retain it inplace. The last named head is enlarged and flat faced as shown to permitit to be engaged by a small wrench for turning if found necessary. Inmost instances however the use of the wrench is entirely unnecessary,for the pin can be rotated by hand. Directing attention to Figure 3 itwill be observed that the pin or key is formed intermediate its endswith an elongated recess 9 which when turned to face the adjacent edgeof the shank 3, serves to permit removal of the entire bit. In order toretain the bit in place, the key is turned so that the solid portionopposite the recessed part 9 is received in one or the other of thekeyway As is usual, the body is provided with common attaching aperturedcars 10.

From the foregoing description and drawings it will be obvious that whenthe bit is in the holder and it is desired to retain it in place, thesolid intermediate portion of the rotary key is turned into the keyway,thus preventing longitudinal slippage of the bit. If, for any reason itis desired to remove the bit, the key is turned so as to dispose thecentral recessed portion 9 of the key opposite the vertical edge of theshank. The key then does not interfere with removal or insertion of thetool. It is to be observed also that, as before stated, the key can bereceived in either one of the keyways in the shank, thus permittinglongitudinal extension or adjustment of the tool.

It is thought that the foregoing description and drawing will suflice toenable the reader to obtain .a clear comprehension of the invention andmanner of using the same. For this reason, a more lengthy description isthought entirely unnecessary.

Having thus described the invention, what I claim is A bit holder of theclass described comprising a body provided with a central polygonalpassage extending entirely therethrough and provided on one side of saidpassage with an opening extended through the body at a right angle tosaid passage,

one side of said opening being in communication with said passage, saidbody being provided with apertured attaching cars, a tool having apolygonal shank slidably received in said passage, said shank beingprorided in one vertical edge with transverse passage provided with anotch, whereby to longitudinally spaced grooves for lQCGPtLOl'l permitthe bolt ;to be turned to pernna re- Or a bolt, a rotary locknig boltextend ng moval and insertion oithe tool. 10

through one of said openings and provided In testimony whereof I aflixmy signaon one end with a head and having its opture. poslte end upsetto maintain it in place, said bolt having that portion opposite saidJAKE DAVIS.

